[Isocops] IBEX Orbit #492 ATS Approval ( 25 June – 4 July 2020 )
Weaver, Carol
Carol.Weaver at unh.edu
Mon Jun 1 18:25:51 EDT 2020
Hi all,
The Angle at orbit 493 apogee after the perigee sun precession maneuver: 4.600 deg
I have looked at the orbit 491 ATS files: IBEX_2020_176_o0492a_BUS_v001.scr, IBEX_2020_176_o0492a_INST_v001.scr and I approve.
The constraint violations in IBEX_2020_176_o0492a_BUS_v001.ccvr and IBEX_2020_176_o0492a_INST_v001.ccvr relate to the removal of the ACT_SetSpinPulseProtectEnable Enable commands (2).
The PL commands in IBEX_2020_176_o0492a_INST_v001.scr match those in the v002 STF (IBEX_2020_176_o0492a_v002.stf).
Ascending and descending command sequences are consistent with each other, 15 Re ascending, the apogee maneuver time, and 15 Re descending as determined by the OEF IBEX_2020_176_o0492a_BUS_v001.oef and verified with ibex_orbit.
There is one star tracker outage. The outage starts about 3.5 hours after 15 Re descending and runs for about 13 minutes.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file IBEX_Orbit492_Contacts.txt for all contacts (4).
We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.
The inertial precession maneuver at perigee of orbit 491 left us pointing in safe directions for the orbit 492 arc A ascending and descending sequences:
ibex_rotate -o -u -0.019289,0.920861,0.389413 -w ibex-sun -t 2020/06:25:03:16:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.019289,+0.920861,+0.389413
which is R.A. +91.200 Decl. +22.918
missing R.A. +94.067 Decl. +23.362 (ibex-sun)
error is R.A. +2.867 Decl. +0.444
for a total 2.674 deg
ibex_rotate -o -u -0.019289,0.920861,0.389413 -w ibex-sun -t 2020/06:28:17:26:27
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.019289,+0.920861,+0.389413
which is R.A. +91.200 Decl. +22.918
missing R.A. +97.817 Decl. +23.246 (ibex-sun)
error is R.A. +6.617 Decl. +0.328
for a total 6.095 deg
The inertial precession maneuver at apogee leaves us pointing in safe directions at the time of the maneuver and for arc B ascending and descending sequences:
ibex_rotate -o -u -0.092726,0.917493,0.386791 -w ibex-sun -t 2020/06:28:19:09:35
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.092726,+0.917494,+0.386791
which is R.A. +95.771 Decl. +22.755
missing R.A. +97.892 Decl. +23.243 (ibex-sun)
error is R.A. +2.121 Decl. +0.488
for a total 2.013 deg
ibex_rotate -o -u -0.092726,0.917493,0.386791 -w ibex-sun -t 2020/06:28:20:44:41
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.092726,+0.917494,+0.386791
which is R.A. +95.771 Decl. +22.755
missing R.A. +97.962 Decl. +23.240 (ibex-sun)
error is R.A. +2.191 Decl. +0.485
for a total 2.075 deg
ibex_rotate -o -u -0.092726,0.917493,0.386791 -w ibex-sun -t 2020/07:03:06:56:01
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.092726,+0.917494,+0.386791
which is R.A. +95.771 Decl. +22.755
missing R.A. +102.573 Decl. +22.951 (ibex-sun)
error is R.A. +6.802 Decl. +0.196
for a total 6.270 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 493 apogee:
ibex_rotate -o -r 102.699 -d 22.935 -w ibex-sun -t 2020/07:03:10:02:29
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.202451,+0.898420,+0.389687
which is R.A. +102.699 Decl. +22.935
missing R.A. +102.699 Decl. +22.935 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r 102.699 -d 22.935 -w ibex-sun -t 2020/07:08:06:47:44
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.202451,+0.898420,+0.389687
which is R.A. +102.699 Decl. +22.935
missing R.A. +107.658 Decl. +22.455 (ibex-sun)
error is R.A. +4.959 Decl. +0.480
for a total 4.600 deg
No Lo O-mode.
There is no overlap with orbit 491 commands by manual inspection or by checking at http://ibex.unh.edu/cgi-bin/ats.cgi<https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fibex.unh.edu%2Fcgi-bin%2Fats.cgi&data=02%7C01%7Ccarol.weaver%40unh.edu%7Cdf111a302fcb4c31d1fe08d7fdbe44e4%7Cd6241893512d46dc8d2bbe47e25f5666%7C0%7C0%7C637256865963311983&sdata=w7X4HBrSTBN0fwCEyxpqJPD7WNEpKS027pIMWrm5eRo%3D&reserved=0>.
Command approval checklist is attached.
Thanks,
Carol
--
Carol Weaver
University of New Hampshire
503.902.8492
From: Nigel Angold <angoldconsulting at earthlink.net>
Date: Monday, 1 June 2020 at 15:49
To: "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com>
Cc: "Weaver, Carol" <Carol.Weaver at unh.edu>, "Chubin, Eric [US] (IS)" <Eric.Chubin at ngc.com>, "Heirtzler, David" <David.Heirtzler at unh.edu>, IBEX FDG <IBEX at applieddefense.info>, IBEX Operations <IBEXOPS at gmail.com>, ISOC <isocops at lists.sr.unh.edu>, Ken Fairchild <fair-play at comcast.net>, "Ken Fairchild (kwfairchild at gmail.com)" <kwfairchild at gmail.com>, Paul Janzen <paul.janzen at umontana.edu>, "Tyler, Ryan S [US] (IS)" <Ryan.Tyler at ngc.com>, "Wesley, Sheral R [US] (IS)" <Sheral.Wesley at ngc.com>, "Wynn, Reese [US] (IS)" <Reese.Wynn at ngc.com>
Subject: Re: IBEX Orbit #492 ATS Approval ( 25 June – 4 July 2020 )
Caution - External Email
I approve IBEX_2020_176_o0492a_BUS_v001.scr for uplink during the upcoming apogee contact: USHI01, LAHO 2K IBEX-1 Orbit# 489 Apogee Tracking Contact 43re Desc, 06/02/20 @ 11:00:00 UTC
I also approve IBEX_2020_176_o0492a_INST_v001.scr for uplink no earlier than the orbit 490 post-perigee contact: USAK01, LAHO 40K IBEX-1 Orbit# 491 Hi BkGnd Test Contact 15re Asc, 06/15/20 @ 23:30:00 UTC
Nigel
All,
Attached are the planning files for Orbit #492
Please respond to this thread with comments and approvals.
Approvals are required by COB on 01 June 2020
Please note the following:
1. I generated 3 separate ATS files BUS, INST and a complete file. The BUS and INST will be the files to be uplinked. The complete ATS, I used as a sanity check to see how the commands lined up. Since we are in a new phase of ATS generation. IF you have any ideas of doing this differently, let me know.
1. The 3 ATS files have been changed to word files and encrypted. I will send out another email with the password. The files that have been transferred via MFT have not been encrypted and are still text files.
1. I moved the 2 House Keeping commands from the INST ATS to the BUS ATS. I commented out the 2 commands in the INST ATS. If for some reason we were unable to uplink the INST Commands for this orbit, we would have been in the wrong spacecraft state for executing the maneuver commands.
1. Battery Balancing this orbit
# Orbit 492 Battery Balancing
# 2020-07-03T17:22:59.141Z,Perigee,orbit:492
Begin - 2020/07:03:15:30:00 End - 2020/07:03:17:00:00
5. PERIGEE: Sun Maneuver - $TIME=2020/07:03:09:47:29
6. # Orbit# 490 Reset Master Timer - 2020/06:16:00:15:00
7. Command Load Constraint Violation Report (CCVR)
IBEX_2020_176_o0492a_v001.ccvr
# Input files: 1
# IBEX_2020_176_o0492a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2020/06/25 01:04:35 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2020/06/28 20:14:41 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
timothy.perry at ngc.com<mailto:timothy.perry at ngc.com>
Office (703) 406-5976
Cell (301) 606-1430
<image001.png>
<IBEX_2020_176_o0492a_BUS_v001.docx><IBEX_2020_176_o0492a_BUS_v001.oef><IBEX_2020_176_o0492a_INST_v001.oef><IBEX_2020_176_o0492a_INST_v001.ccvr><IBEX_2020_176_o0492a_BUS_v001.ccvr><IBEX_2020_176_o0492a_v001.ccvr><IBEX_2020_176_o0492a_v001.docx><IBEX_2020_176_o0492a_INST_v001.docx><IBEX-Command-Approval-Checklist-Rev16_F_492_TEP.docx><IBEX_Orbit492_Contacts.txt>
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